SmogRank / Chile / O'Higgins Region / Rancagua
Rancagua, month by month
Rancagua has a measured daily mean on 1,293 days since 1 January 2023. Its worst month was July 2024, at 169 US AQI (80.5 µg/m³), 6th of 2,566 cities on that month's world ranking. Its cleanest was January 2025, at 66 US AQI (17.2 µg/m³). 2025 averaged 91 US AQI (30.8 µg/m³), against 96 US AQI (33.0 µg/m³) in 2024.
Every month since 2023
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Months without a mean, and why
2 months
| Month | Why |
|---|---|
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 3 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Rancagua's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2024 | 16980.5 µg/m³ | 6thof 2,566 | Southern Chile, July 2024 Chile, July 2024and 1 more |
| July 2025 | 15662.7 µg/m³ | 12thof 2,889 | – |
| July 2023 | 15257.6 µg/m³ | 7thof 1,432 | Southern Chile, July 2023 |
| June 2026 | 15155.6 µg/m³ | 32ndof 2,497 | – |
| June 2025 | 14653.8 µg/m³ | 34thof 2,508 | – |
| June 2023 | 14653.7 µg/m³ | 17thof 1,603 | – |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
Rancagua's worst days
| Day | US AQI | Episode |
|---|---|---|
| 14 Jul 2024 | 279204.0 µg/m³ | Chile, July 2024 |
| 17 Jul 2023 | 204129.0 µg/m³ | Southern Chile, July 2023 |
| 12 Jul 2024 | 202127.0 µg/m³ | Chile, July 2024 |
| 13 Jul 2024 | 202127.0 µg/m³ | Chile, July 2024 |
| 30 Jun 2024 | 194117.0 µg/m³ | Southern Chile, 30 June to 1 July 2024 |
| 15 Jul 2024 | 193116.0 µg/m³ | – |
| 9 Jul 2024 | 187106.7 µg/m³ | – |
| 23 May 2026 | 187106.5 µg/m³ | – |
| 13 Jul 2025 | 186105.5 µg/m³ | – |
| 13 Jun 2023 | 185104.5 µg/m³ | – |
Daily means, the highest since 1 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, Rancagua, Chile, 1 Jan 2023 – 11 Oct 2026. Monitor data from Chile - SINCA via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/cl/rancagua/history (accessed 12 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
Rancagua now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).